<template>
  <div class="app-container">
    <!-- 表格 -->
    <el-table
      v-loading="listLoading"
      :data="list"
      element-loading-text="数据加载中"
      border
      fit
      highlight-current-row
      row-class-name="myClassList"
      :default-sort = "{prop: 'date', order: 'descending'}"
    >
      <el-table-column label="序号" width="70" align="center">
        <template slot-scope="scope">
          {{ (page - 1) * limit + scope.$index + 1 }}
        </template>
      </el-table-column>

      <el-table-column label="消息标题" width="200" align="center">
        <template slot-scope="scope">
          {{ scope.row.content.title }}
<!--          <div class="info">-->
<!--            <div class="title">-->
<!--              {{ scope.row.content.title }}-->
<!--            </div>-->
<!--          </div>-->
        </template>
      </el-table-column>
      <el-table-column label="消息内容" width="470" align="center">
        <template slot-scope="scope">
          {{ scope.row.content.detail }}
        </template>
      </el-table-column>

      <el-table-column prop="date" label="发布时间" sortable width="200" align="center">
        <template slot-scope="scope">
          {{ scope.row.createTime }} <!-- scope.row.createTime.substr(0, 10)-->
        </template>
      </el-table-column>

      <el-table-column label="操作" width="150" align="center">
        <template slot-scope="scope">
          <el-button
            type="text"
            size="mini"
            icon="el-icon-delete"
            @click="removeDataById(scope.row.id)"
          >
            删除
          </el-button>
        </template>
      </el-table-column>
    </el-table>

    <!-- 分页组件 -->
    <el-pagination
      :current-page="page"
      :total="total"
      :page-size="limit"
      :page-sizes="[10, 20]"
      style="padding: 30px 0; "
      layout="total, sizes, prev, pager, next, jumper"
      @size-change="changePageSize"
      @current-change="changeCurrentPage"
    />
  </div>
</template>

<script>
import messageApi from '@/api/message'

export default {
  data() {
    return {
      listLoading: true, // 是否显示loading信息
      list: null, // 数据列表
      total: 0, // 总记录数
      page: 1, // 页码
      limit: 10, // 每页记录数
    }
  },

  created() {
    // 当页面加载时获取数据
    this.fetchData()
  },

  methods: {
    //删除课程
    removeDataById(id) {
      // debugger
      this.$confirm(
        '此操作将永久删除该消息，是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      )
        .then(() => {
          return messageApi.removeMessageById(id)
        })
        .then(() => {
          this.fetchData()
          this.$message({
            type: 'success',
            message: '删除成功!'
          })
        })
        .catch(response => {
          // 失败
          if (response === 'cancel') {
            this.$message({
              type: 'info',
              message: '已取消删除'
            })
          }
        })
    },

    fetchData(page = 1) {
      // 调用api层获取数据库中的数据
      console.log('加载列表')
      // 当点击分页组件的切换按钮的时候，会传输一个当前页码的参数page
      // 解决分页无效问题
      this.page = page
      this.listLoading = true
      messageApi
        .getPageList(this.page, this.limit)
        .then(response => {
          this.list = response.data.items
          this.total = response.data.total

          this.listLoading = false
        })
    },
    // 每页记录数改变，size：回调参数，表示当前选中的“每页条数”
    changePageSize(size) {
      this.limit = size
      this.fetchData()
    },

    // 改变页码，page：回调参数，表示当前选中的“页码”
    changeCurrentPage(page) {
      this.page = page
      this.fetchData()
    }
  }
}
</script>

<style scoped>
.myClassList .info {
  width: 450px;
  overflow: hidden;
}
.myClassList .info .pic {
  width: 150px;
  height: 90px;
  overflow: hidden;
  float: left;
}
.myClassList .info .pic a {
  display: block;
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
}
.myClassList .info .pic img {
  display: block;
  width: 100%;
}
.myClassList td .info .title {
  width: 280px;
  float: right;
  height: 90px;
}
.myClassList td .info .title a {
  display: block;
  height: 48px;
  line-height: 24px;
  overflow: hidden;
  color: #00baf2;
  margin-bottom: 12px;
}
.myClassList td .info .title p {
  line-height: 20px;
  margin-top: 5px;
  color: #818181;
}
</style>
